Dep no they are not extremely similar across the line.
Like any manufacturer there will be a house sound, but it does change a bit as you go from model to model.
The 3F sounds similar but different to the 5F. We demoed the 3F to 5F comparison at another dealer and the 5F was a bit more mellow, had a bigger soundstage and of course had more bass.
The Persona 7 and 9 are the same speakers with the 7F not having the 9’s active bass.
The Persona 7 and 9 also use different bass drivers then the 3F and 5F.
Do they sound similar? Yes they do, but there are still audible differences between the models.
We demoed the 3F in the exact same room with the same gear, as our 9H and they sounded very different.
As per the Personas 9 needing less of an amp, because the bass is powered, again not true, as the 100 watt Manley tube amp, the Snappers are fantastic did not sound as good, as the CJ which were 275 monos, nor did the Devialet, nor did the Electrcompanient, nor did the Thrax gear the T+A gear was clearly the best sounding this was the consensus for both the Polymers MKX-S our previous reference loudspeakers and the Persona 9H.
As per your ridiculous assertion that the majority of your budget should be spent on speakers, look back at the car analogy.
If the heart of your car is the engine, the loudspeakers, and the rest of the car is your electronics and ancellory products, then this analogy should make it perfectly clear,
Take a 600 hp Ferrari engine and drop it into a Toyota Camery and lets take it for for a drive, did you just save your self $200,000.00 by creating this pairing? Now ;ets suppose that the car’s transmission could actually handle the horse and power, do you think that the Camery has the braking power, suspension to enable this mess to actually drive? The second you would try braking into a corner you would be dead as the suspension and brakes would be woefully inadequate for the job at hand and you would be headed to the guard rail and your untimely demise.
There is a reason why a high perfromance sports car drives like it does. A high perormance sports car is built around all the major subassemblies peforming their function optimally and in concert with each other.
If you have a great engine, you need adaquate brakes to stop the car and high performance braking systems are expensive, so is the suspenson system which must hold everything together which also includes the entire frame and body which must also do its job. Hence a $200k sports car costs $200k because it is built with all of its parts working together and specified to provide a working envelope that the vehicle can perform optimally in.
Substitute any cheapie parts and watch the car's ability to perform be compromised severely.
In our experience the electronics and source components, should cost 1 to 2 times the cost of the loudspeaker as a general rule. The addage garbage in garbage out is very true in audio. That is not to say that you can't buy a $5k amp and run a $10k set of speakers nicely that is also summising that you are not getting all you can get out of those $10k loudspeakers.
That is also not to say that you can't sometimes find value pairings that can sound surprisingly excellent but as a general rule the more exotic and expensive a loudspeaker is the higher the quality of what you need to drive it is going to be.
As per the other point that someone made about the Anthem electronics they are excellent for the price, but do you honestly think that the Anthem design team brought in tons of different competiting brands and tested and evaluated how they could build a better product, or did they forumulate some ideas, design a circuit based on some of their previous work and then build said product.
We have done these kinds of tests and the Anthem STR amp and preamp are great, but not in the same degree of great as the T+A gear or the Krell Illusion preamp and 300XD are.
So the moral of this story is if you are looking at this kind of product you must be prepared to use the right gear.
As per your doubling the electronics comment, we demoed the 3F at a client using a very good older Classe Intergrated amplifier a $5k amp along with a T+A dac so this would be a $10k package and the 3F didn’t sound a lot better than his older Dali Helicons.
Switched in a Naim Nac 272 preamp/dac and a Naim 250Dr and boom the 3F sprang to life, and sounded fantastic.
So again your experiences don’t mirror ours at all. The right set of electronics, cabling, and source components can make or break a set of speakers.
As per a dealer blowing out any product, so have we, certain products didn’’t work in our store or were not to our preference that doesn’t invalidate that product it just means it wasn’t working for us and our clientele, the same can be said of other dealers.
All I can tell you is when our Persona 9h are running with the T+A gear and a good source, the sound is among the most three dimensional and life like sounding systems we have ever heard and that includes some crazy expensive systems that are $200-400k.
Dave and Troy
Audio Doctor NJ Persona dealers